Valve and valve-seat grinder.



H. McLEAN.

VALVE AND VALVE SEAT GRINDER. APPLICATION FILED JULY 27.1917.

1,290,766. Patented Jan. 7,1919.

HUG-H McLEAN, or BA HURsT, NEW BRUNSWICK, CANADA.

VALVE AND VALVE-SEAT GRINDER,

Application filed July 27, 1917. Serial No. 183,078.

To all whom it may concern:

Be it known that I, HUGH MCLEAN, a subject of the King of Great Britain, and resident of the town of Bathurst, in the Province of New Brunswick, in the Dominion of Canada, have invented certain'new and useful Improvements in Valves and Valve-Seat Grinders, of which the following is the specificatiol The invention relates to improvements in valve and valve seat grinders as described in the present specification and illustrated in v the accompanying drawings that form part of the same.

The invention consists essentially of the novel construction and arrangement, whereby the cutters and accompanying parts are so formed as to facilitate the manual'operation in grinding with exactitude.

The objects of the invention are to devise a tool that Will lend itself readily to the quick repairing of valves and eliminate the necessity of expert mechanical attention in such matters, to lessen the labor and expense of repairs, to increase the compression in an means of tight fitting valves and engine by to provide a simple, cheap and generally durable means for the aforesaid purposes.

' In the drawings Figure 1 is a vertical sectional view showing the holder, the cutter and the valve and a full View of the operating handle, the engaging rod and the valve seat cutter.

Fig. 2 is a sectional View of a valve seat and grinder and the operating handle full. Fig. 3 is a detail showing another form of engaging rod.

Fig. 4 is a detail of a centering rod. Fig. 5 is a plan view of the valve cutter. Fig. 6 is a detail of the centering plug. Like numerals of reference indicate corre sponding parts in each figure.

Referring to the drawings, the cutter 1 formed of the blades 2 extends from the tapered ring base 3, said blades terminating at the extremity of the flange 4 at the outer end of said ring base 3 and in their outward inclined way widening and preferably arranged obliquely across the radial line from the ring.

The cutting edges of the blades 2, each slant at an inclination from the perpendicular corresponding to the bevel of the valve 5 from which the stem 6 projects, the said bevel being of course identical in the seat 7.

The cutter 8 is precisely the reverse of the Specification of Letters Patent.

' outfit.

The engaging rod 22 is made with a blade Patented Jan. 7, 1919.

clltter 1 and bevel of the ring-body and are also preferably set obliquely or diagonally and are adapted to engage the seat 7.

The operating handle 10 is made with the grip bar 11 and the body 12, which at its lower end terminates in the reduced lower end 13 forming'the tapered socket 14, said lower end 13 being externally threaded up to the cutter 8, which is mounted on said lower end inside the retaining nut 15.

The holder 16 is preferably formed with the shank 17 flattened at each side, so as to be readily secured in a vise.

The outer portion of said holder 16 is recessed to form a comparatively large socket 18 with a tapered wall and the lower shank portion 17 is centrally bored to form a tapered socket 19 for the centering plug 20, the taper of the socket 19 either or inwardly as preferred, though ing the same inclination as the tapered sockets.

The centering plug 20 is formed correspondingly tapered to its socket and with a central stem'hole 21, whichmay be of any size required for the particular type of maintainaforesaid valve, thus tWo or more of said plugs having difierent sized stem holes may be used inan end 23 to engage in a corresponding recess in the valve face and an enlarged tapering end 24 fitting in the tapered socket 14. This rod may be of any suitable make or size so long as one end is made to fit in the handle socket. In Fig. 3 the engaging rod is shown with the prongs 25, as some valves are made with prong holes to receivesaid prongs for turning purposes.

The centering rod 26 has an enlarged end 27 tapered to fit the same socket 14, and in diameter corresponding to the stem of the valve for the seat being ground.

In the operation of the invention the valve is dropped into serted through a corresponding hole in a centering plug closing up the center of the ring 3, thereby insuring positively the even grinding of the valve. The holder is then placed in a vise or otherwise suitably held.

The engaging rod suitable to the valve is applied and the handle turned quite lightly for its weight is almost suflicient to face the valve with the cutter blades.

The engaging .rod is then removed and a outwardly the cutter 1 and the stem inits blades 9 are formed in the off centering rod inserted in'the handle socket. This centering rod is introduced into the valve stem orifice and the seat is ground by the cutter 8.

Following these operations the valve is turned, by means of the engaging rod and handle, on the seat, some emery powder and oil being first applied between said valve and seat.

It will be-thus seen that the valve and seat can be completely finished off with this tool and the tight fitting of said valve to said seat fully assured, and further that an outfit can be furnished that will assuredly take in almost every valve used in explosion engines, therefore for motor cars and boats a valuable tool is provided, as simply by the interchange of a few parts the tool' is converted from being applicable to one valve and seat, to be applicable to another.

Also it may be noted that the interchangeability of this cutter for the different sizes of valves used is only limited bythe length of the teeth of the cutters or otherwise the depth of the bevels of the cutters.

Various changes may be made in making up the parts of this invention, without departing from the spirit of the invention, so long as they remain within the scope of the 0 claims for novelty following.

What I claim is 1. A portable hand tool comprising a handle having a cutter shank and a rod socket in said shank, a valve seat cutter mounted on said shank, an operating rod having its upper end formed to fit in said socket and its lower end to engage a valve, a holder forming a valve cutter socket and formed to be rigidly engaged and having a tapered recess from'its under side and a'tapered centering plug shaped to fit said recess and having a valve stem hole therethrough.

2. A portable hand tool comprising a holder shaped to fit in a vise and recessed in the under side to receive a centering plug, a beveled cutter fitting into said holder and having oblique cutting edges, a centering plug in said recess having a stem recess, a rod adapted to engage the valve in grinding operations and having a tapered upper end, a handle having a reduced lower end to its shank screw-threaded for a portion of its length and forming a tapered socket for said rod, acutter in bevel form having oblique cutting edges and mounted on said reduced lower 'end and adapted to grind the seat following the grinding of the valve, and a nut screwed on to said reduced end and holding said cutter in place.

Signed at the city of Montreal, Canada, this 26th day of June, 1917.

HUGH MoLEAN.

Witnesses:

RITA HAMER, V. I. FETHERS'I'ONHAUGH. 

